3. The genetic code is commaless, which means that no codon is reserved for punctuations. It means that after one amino acid is coded, the second amino acid will be automatically, coded by the next three letters and that no letters are wasted as the punctuation marks (Fig.
Summer solstice is the first day of summer - it's usually between June 20th and June 23rd. In 2016, the summer solstice takes place on June 20th. We know it's summer because the earth's axis tilts toward the sun from June to September - this means warmer weather and longer days.
On Summer Solstice, you would see the Sun rise on your horizon at the eastern point of the longest track. It would follow the track high in your sky, and eventually set on the western horizon. It would be up for about 17 hours, thus making summertime days long and warm.